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(No Model.)

J. 8v R. WOOD.

- PULP STRAINER. i No. 361,107. PanteltedAprl 12, 1887.

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UNI-Tan STATES JOHN WOOD AND ROBERT VOOD, OF LEITH, COUNTY OF MID-LOTHIAN SCOTLAND.

PU LP-STRAINER.

SPECIFICATION forming part of Letters Paten-t No. 361,107, dated April l2, 1887. l Application filed September 1, 1886. Serial No. 212,384. (No model.)

.T all whom t may concern:

Beit known that we, JOHN WOOD and ROB- ERT WOOD, subjects of the Queen of Great Britain, and residing at Leith, in the county of M idLothian, Scotland, have invented Im provements in Pulp-Strainers, of which the following is a specification.

Our invention relates to pulp-straining apparatus of the kind in which a pulsating action is imparted to the pulp in a manner to draw it through the strainer-plates by means of pumps acting on air or other suitable fluid, which is separated from the pulp by a diaphragm of a suitable liexible but impermeable material, such as sheet rubber. By our present invention we improve the construction and arrangement of the parts of the apparatus with the object of obtaining a better action, and more particularly so as to render the pulsating action more uniformly distributed over the extent of the strainer-plates.

In carrying out our invention the strainer plates are iXed horizontallyin an oblong vat,

at one end of which the pulp to be operated on is admitted, and the length of which is suitable for sufiiciently treating the pulp asit iiows from one end to the other. Two pulsating. iiexible diaphragms are placed belowT the strainer-plates, and air or other i'luid beneath these diaphragms is acted on by two pumps fixed to the bottom of the vat, one below the cent'ervof each diaphragm.

On the accompanying sheet of drawings, Figure 1 is an end elevation. Fig. 2 is a sectional side elevation, and Fig. 8 is a horizontal section. In Fig. 3 the strainer-plates and iiexible diaphragms4 5, Fig. 2, are absent.

The vat ,which is in the form of a shallow open-topped cast-iron boX, is supported by end frames, 7, fixed on a baseplate, 8. The bottom of the vat is formed with openings communicating directly with the upper ends of t'wo cylinders, 9 bolted to the vat-bottom. These cylinders are {itt-ed with plungers or deeppistons 10, which work through stuflingboxes and have jointed tothem the upper ends of connecting-rods 11, the lower ends of which are jointed upon crank-pins 12 at the ends of a horizontal shaft, 13, carried in pedestal-bearings 14, xed on the sole-plate 8. The shaft 13 carries fast and loose pulleys 15 for a driving-belt, and has fixed on it a ily-wheel,16. The crank-pins 12 are adjustable upon the ends of the shaft 13, so that the stroke of the pistons 10 may be varied to suit different qualities of pulp. The pistons 10 are lubricated by water admitted through regulating-cocks 17, and any surplus water is led off by overliowpipes 18, enteringthe cylinders 9 at a slightly higher level than the water-inlets.

.Above each ofthe cylinder-openings in the bottom of the vat 6 there is placed a baiilingplate, 19, supported at two opposite points, and having a few holes made through it.

These bailiingplates are for the purpose of preventing the impulses caused by the pistons from acting too directly on the middles of the iiexible diaphragms 5, and foriv rendering the pulsating action approximately uniform over the whole of each diaphragm. Each iiexible diaphragm 5 is fixed by its edges to a wooden frame, 20, which is itself iiXed in a watertight manner on an iron frame madewith a rib fitting in a groove formed in the bottom of the wood frame 20, th'is iron frame being itself bolted to the vat-bottom and the joint made water tight. which are ot' a kind now commonly used, are iixed in a usual manner upon a ledge formed for them across the entering end ot' the vat (the right-hand end in Fig. 2) along the sides and along the top of a low transverse partition, 21, near the opposite end. rlhe pulp t0 be operated on is led by a pipe into a feed-box, 22, at the entering end, and, passing under an adjustable dippingboard, 23 in that box, Hows thence over the strainer-plates 4. The pulp, which passes through the straincr-plates 4., leaves the vat by four Openings-two, 24, at the middle and two, 25, at the end opposite the inlet end. The two middle outlets,24,com municate by a transverse pipe, 26, beneath the vat with one end of a service-box, 27, andthe two end outlets, 25, communicate with the other end of the service-box 27 through a pipelike passage, 2S, formed in the end frame, 7. The service-box 27 is made with three compartments, the pipes 2 6 28 being connected to the end compartments, while the middle compartment is made with a delivery-spout, 29. The

The strainer-plates 4,

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strained pulp flows from the end compartments over partitions or weirs 30,the heights of which are adjustable by screw-spindles acting on movable boards7 and their use is to prevent air from getting into the space between the strainer-plates 4 and the flexible diaphragms 5. The fibrous or other ingredients which do not pass through the strainer-plates 4 pass over them to a trough, 31, at the end of the vat, and are discharged therefrom through a cock, 82.

Vhat we claim as our invention in pulpstraining apparatus is l. In combination, an oblong Vat with inlet at one end, horizontal strainer-plates fixed across the vat, two flexible diaphragnis fixed horizontally below the strainer-plates, cylinders fixed to the bottom of the vat and in direct communication with the spaces under the flexible diaphragms, and pistons in the cylinders, such pistons being connected to cranks on a rotating shaft below the vat, all arranged and operating substantially as and for the pun poses herein set forth.

2. In combination, cylinders with their pistons, the cylinders colnnmnicating directly through openings in the bottom of a pulpstrainer vat with spaces under flexible diaphragms, and baflingplates over the said openings, substantially as and for the purposes herein set forth.

3. In combination, an oblong arrangement of strainerplates, an inlet at one end for the pulp to be operated on, two pulsating flexible diaphragms below the strainer-plates, outlets for the strained pulp at the middle and at the end opposite to the inlet end, and a trough at the extreme end for fibrous or other ingredients which do not pass through the strainerplates, all arranged and operating substantially as' herein set forth.

In testimony whereof we have signed our naines to this specification in the presence of two subscribing witnesses.

JOHN WOOD. ROBERT WOOD.

Vitnesses:

OscAR MALMRos, HUGH O. Pnncooii. 

